It's all come down to this Monday.

On the season two finale, viewers will finally be introduced to A, as a masquerade ball on "UnmAsked" will answer the single most pressing question on the ABC Family hit - and will also lead to many more, Lisa Cochran-Neilan says.

Are you ready? Have any guesses regarding A's identity? Take them now, and then check out two clips from the episode, both of which implicate Melissa and one of which depicts an inspired Spencer...

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.